diff --git a/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/no-coop-coep.https.any.js b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/no-coop-coep.https.any.js
index 71e5299a66cec..b858eb61cbc10 100644
--- a/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/no-coop-coep.https.any.js
+++ b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/no-coop-coep.https.any.js
@@ -5,13 +5,66 @@ test
 =
 >
 {
+assert_equals
+(
+globalThis
+.
+SharedArrayBuffer
+undefined
+)
+;
+assert_false
+(
+"
+SharedArrayBuffer
+"
+in
+globalThis
+)
+;
+}
+"
+SharedArrayBuffer
+constructor
+does
+not
+exist
+without
+COOP
++
+COEP
+"
+)
+;
+test
+(
+(
+)
+=
+>
+{
 const
 sab
 =
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 const
 channel
@@ -63,9 +116,24 @@ const
 sab
 =
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 const
 channel
@@ -131,9 +199,24 @@ const
 sab
 =
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 assert_throws_dom
 (
diff --git a/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-idb.any.js b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-idb.any.js
index ba046248fae46..67189908fcd75 100644
--- a/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-idb.any.js
+++ b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-idb.any.js
@@ -53,6 +53,29 @@ key
 }
 )
 ;
+const
+sab
+=
+new
+WebAssembly
+.
+Memory
+(
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
+)
+.
+buffer
+;
 assert_throws_dom
 (
 "
@@ -73,10 +96,7 @@ key
 1
 property
 :
-new
-SharedArrayBuffer
-(
-)
+sab
 }
 )
 ;
@@ -153,6 +173,29 @@ key
 }
 )
 ;
+const
+sab
+=
+new
+WebAssembly
+.
+Memory
+(
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
+)
+.
+buffer
+;
 let
 getter1Called
 =
@@ -199,10 +242,7 @@ return
 ;
 }
 }
-new
-SharedArrayBuffer
-(
-)
+sab
 {
 get
 x
diff --git a/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-notifications-api.any.js b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-notifications-api.any.js
index 1054270bc4f64..769c3fce8983b 100644
--- a/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-notifications-api.any.js
+++ b/testing/web-platform/tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/serialization-via-notifications-api.any.js
@@ -20,6 +20,29 @@ DataCloneError
 =
 >
 {
+const
+sab
+=
+new
+WebAssembly
+.
+Memory
+(
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
+)
+.
+buffer
+;
 new
 Notification
 (
@@ -31,10 +54,7 @@ Hi
 {
 data
 :
-new
-SharedArrayBuffer
-(
-)
+sab
 }
 )
 ;
@@ -65,6 +85,29 @@ test
 =
 >
 {
+const
+sab
+=
+new
+WebAssembly
+.
+Memory
+(
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
+)
+.
+buffer
+;
 let
 getter1Called
 =
@@ -112,10 +155,7 @@ return
 ;
 }
 }
-new
-SharedArrayBuffer
-(
-)
+sab
 {
 get
 x
diff --git a/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-failure.https.any.js b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-failure.https.any.js
index c026634e5773d..479c7d6133b48 100644
--- a/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-failure.https.any.js
+++ b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-failure.https.any.js
@@ -9,10 +9,24 @@ const
 sab
 =
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
-16
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 const
 ta
diff --git a/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-success.any.js b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-success.any.js
index 70e69366c231f..5c0ad02e82996 100644
--- a/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-success.any.js
+++ b/testing/web-platform/tests/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-agent-formalism/requires-success.any.js
@@ -9,10 +9,24 @@ const
 sab
 =
 new
-SharedArrayBuffer
+WebAssembly
+.
+Memory
 (
-16
+{
+shared
+:
+true
+initial
+:
+1
+maximum
+:
+1
+}
 )
+.
+buffer
 ;
 const
 ta